Cyclomedusa is probably the most common and widespread Vendian
fossil. It also has one of the largest size ranges, ranging from a few
millimeters to about a meter in diameter. Formerly thought to represent
a planktonic (floating) jellyfish of some sort, Cyclomedusa is now
considered by some to have been a benthic (bottom-dwelling) polyp, somewhat
like a sea anemone. It reproduced by
division in two or by budding. This specimen is about 5 cm across and comes
from the Winter Coast of the White Sea.